How to use the digital screen to display a large number of test pens
neon bulb pencil
The biggest feature of the neon bulb electric pen is that when the electric pen touches the charged body, the neon bulb will light up, and the tip of the pen is a small screwdriver, which can also be used in an emergency. Now there are detachable products on the market, and the double-batch head can be replaced at will, which is very practical.
Instructions
The index finger and middle finger clamp the absolute part of the electric pen, the thumb presses the metal contact at the back end of the electric pen, and touches the charged body lightly with the tip of the pen.
working principle
Using the human body as a circuit, it lights up when the voltage reaches the working voltage of the neon bulb.
Precautions
1. Before the electric test, confirm the quality of the electric pen on the charged body with electricity to ensure that there is no misjudgment.
2. During the electric test, the body should not touch the metal part of the front end of the electric pen to avoid electric shock.
3. Read the instructions carefully before use, pay attention to the range, some are 50v~500v, some are 110v500v.
4. Pay attention to distinguish between AC and DC.
5. When you are not sure, use a multimeter and don't take chances.
6. The body is insulated from the earth.
Digital display electric pen.
Digital electric pen, when measuring, the voltage will be displayed on the screen, usually the largest number displayed on the electric pen screen is the measured voltage. But I always feel a little unreliable.
Instructions.
There are two test buttons on the electric pen, direct test and induction breakpoint test. When we use it, we only need to choose to touch these two buttons according to the purpose of our test.
Measure continuity.
This function is the benefit of digital display electric pens over neon bulb electric pens. When measuring, it is necessary to disconnect the power supply, pinch one end of the wire with one hand, touch the sensor button with the thumb of the other hand, and touch the other end of the wire with the bit of the electric pen. The light bulb lights up, indicating that the wire is connected.
Measure breakpoints.
This function is not easy to use, especially the multi-core cable is unpredictable and insensitive.
Although this electric pen directly displays the voltage, its accuracy is questionable. Many electrician friends have reported that sometimes it is not accurate at all, and even misjudgment may occur.
The light is too bright to see clearly, the light is too dark to see clearly, and the readings sometimes flicker, which is its shortcoming. So I generally don't use digital pens.
Sound and light alarm induction electric pen.
This kind of electric pen is a new product released in recent years. It is very convenient to judge whether an object is charged or not. It is also very clear to distinguish between zero and live wires. It is not limited by environmental light factors, and it is very practical to measure breakpoints. The disadvantage is that the voltage is not displayed, at least so far, I have not used this function.
The whole body of the electric pen has a plastic casing to reduce the possibility of electric shock. It is super simple to use, turn on the power first when measuring, and some directly press and hold the power button. If the electromagnetic field is strong, it will alarm without touching the charged body, which indirectly reduces the possibility of our charging.
Personal experience, the above three electric pens have their own strengths, but they can only test whether the object is charged, and cannot accurately judge the voltage. When we need to measure the accurate voltage of the charged object, the multimeter is still reliable.
